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A Fluidic Dump Combustor For Ramjet Engines
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Book Synopsis A Fluidic Dump Combustor for Ramjet Engines by :
Download or read book A Fluidic Dump Combustor for Ramjet Engines written by and published by . This book was released on 2009 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flame stabilization is the act of maintaining combustion in the presence of a high-speed premixed flow, and continues to be an important process that influences the performance and limitations for propulsion applications. A common approach for current generation flame holders involves the employment of a low-speed recirculation zone where hot combustion products are maintained and act as a continuous ignition source. The recirculation zone is often induced using a wake-generating bluff body that is submerged in the flow, or through the use of a rearward facing step. A fluidic-based flame holder using a transverse slot jet issuing into a cross flow offers potential thrust and efficiency benefits for propulsion. The transverse slot jet flame holder has been shown to develop a low-speed recirculation zone capable of stabilizing a stationary flame, analogous to a rearward-facing step (i.e. a wall-bounded bluff body).
Book Synopsis A Numerical Determination of the Combustion Time Lag in a Ramjet Dump Combustor by : Richard James Clifford
Download or read book A Numerical Determination of the Combustion Time Lag in a Ramjet Dump Combustor written by Richard James Clifford and published by . This book was released on 1989 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low Frequency Pressure Oscillations in a Model Ramjet Dump Combustor by : Kenneth Hyupsang Yu
Download or read book Low Frequency Pressure Oscillations in a Model Ramjet Dump Combustor written by Kenneth Hyupsang Yu and published by . This book was released on 1989 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Spray and Combustion Characteristics of a Dump-type Ramjet Combustor by : Choong-Won Lee
Download or read book Spray and Combustion Characteristics of a Dump-type Ramjet Combustor written by Choong-Won Lee and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis FY ... US Air Force Plan for Defense Research Sciences by :
Download or read book FY ... US Air Force Plan for Defense Research Sciences written by and published by . This book was released on 1984 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Visualization and Experimental Optimization of Three Inlet-side-dump Liquid-fuel Ramjet Combustors by : Ronald Frank Salyer
Download or read book Flow Visualization and Experimental Optimization of Three Inlet-side-dump Liquid-fuel Ramjet Combustors written by Ronald Frank Salyer and published by . This book was released on 1993 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three distinct inlet-side-dump ramjet-combustor geometric configurations were investigated. Non-intrusive watertunnel flow-visualization techniques were utilized to qualitatively determine optimum flame-stabilization dome lengths and fuel-injection locations. The results were in good agreement with the results from previous studies. The optimum dome lengths which provided good fuel distribution and steady mixing all had lengths between 0.31 D and 1.4 D. Fuel injection in a narrow region on the upstream side of the inlet cross section was the only location capable of distributing fuel into the flame- holding region. Multiple injection locations in the inlet were required to distribute fuel uniformly into the main combustion region. The dual, axially-in- line side-dump configuration demonstrated the best potential for increasing performance across a wide range of operating conditions due to the ancillary combustion region between the inlets and the ability to control the size and strength of the region by varying air mass flow through the two inlet dumps.
Book Synopsis Flow Induced Tones in a Side Dump Ramjet Combustor by : Gregory C. Hildebrand
Download or read book Flow Induced Tones in a Side Dump Ramjet Combustor written by Gregory C. Hildebrand and published by . This book was released on 1988 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Combustion Efficiency in a Dual-inlet Side-dump Ramjet Combustor by : Martin W. Deppe
Download or read book Combustion Efficiency in a Dual-inlet Side-dump Ramjet Combustor written by Martin W. Deppe and published by . This book was released on 1994 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dual, axially-in-line, side-dump, liquid-fueled ramjet combustor was designed and tested with varying fuel-air ratios, atomizer types, and air distributions between the two inlets. Particle size distributions produced by the atomizers were measured at the inlet duct plane. When operated in a contra- flow direction, all of the atomizers produced excellent atomization with a Sauter mean diameter less than 14 microns. The dual, in-line inlets provided improved flammability limits and combustion efficiencies at lean fuel-air ratios when compared to single side-dump performance. Direct injection of approximately 20% of the fuel flow into the dome region was found to provide improved lean flammability limits for the single side-dump, but was not required with the dual inlets. The fuel distribution in the inlet duct required for good flammability limits and combustion efficiency was opposite to that required to prevent pressure oscillations, indicating that a dump plane aero-grid will often be necessary. A dump angle of 45 deg resulted in lower than desired combustion efficiencies, apparently due to poor mixing with the air from the aft inlet.
Book Synopsis Coaxial Dump Ramjet Combustor Combustion Instabilities by : D. L. Davis
Download or read book Coaxial Dump Ramjet Combustor Combustion Instabilities written by D. L. Davis and published by . This book was released on 1981 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains Combustion Instability Data for Coaxial Dump Ramjet Combustors. The data includes pressure vs. time, RMS pressure spectrums, peak and broadband RMS pressures, and related steady state performance data. Analysis and interpretation of the data are reserved for future reports. Also included is a description of RMS pressure and its relation to wave shape.
Book Synopsis Numerical Study of Reactive Ramjet Dump Combustor Flowfields with a Pressure Base CFD Method by : Ten-See Wang
Download or read book Numerical Study of Reactive Ramjet Dump Combustor Flowfields with a Pressure Base CFD Method written by Ten-See Wang and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dump Combustor Parametric Investigation by : Frank D. Stull
Download or read book Dump Combustor Parametric Investigation written by Frank D. Stull and published by . This book was released on 1974 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of scale model coaxial dump combustors from 2 inch to 5 inch D were tested on a thrust stand with JP-4 fuel over a wide range of ramjet test conditions. Baseline conditions were selected to approximate 'pressure scaling criteria' in which chamber pressure times combustor diameter remains constant. JP-4 fuel was injected perpendicular to the airstream from eight plane tube injectors. Fuel/air ratio, chamber pressure and nozzle throat diameter were varied for each size chamber. Lean blow-out limit, combustion efficiency, combustor pressure drop, and combustion instability characteristics were obtained for each test point.
Book Synopsis Flame Driving of Longitudinal Instabilities in Liquid Fueled Dump Combustors by : Ben T. Zinn
Download or read book Flame Driving of Longitudinal Instabilities in Liquid Fueled Dump Combustors written by Ben T. Zinn and published by . This book was released on 1987 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report describes the results of experimental and theoretical investigations of the mechanisms by which the core flow combustion process in coaxial, single inlet, dump type ramjet engines drives longitudinal combustion instabilities. To this end, the behavior of V-shaped flames, similar to those often occurring in ramjet combustors, stabilized in longitudinal acoustic fields has been studied. The presence of burning vortical structures is observed in the flame region. These structures appear at frequencies close to the first natural acoustic frequency of the combustor and are believed to be connected with a shear layer type of instability of the flame. Experiments conducted show that the unsteady combustion in these structures is capable of driving the acoustics at the fundamental acoustic mode frequency. With increase in fuel air ratio, a spontaneous instability involving the fundamental mode is observed and explained in terms of increased driving associated with the higher, unsteady heat release rates. The results of experiments conducted with external acoustic excitation of the flame at different frequencies are also reported and confirm the idea that the vortical structures arise due to a fluid mechanical instability of the flame. It is shown that the interactions between the vortical structures and the system's acoustic field affect the heat release rates from the flame and provide a mechanism for the driving of longitudinal mode instabilities. Keywords: Coaxial dump type ramjet, Flame driving, Combustion, Acoustics longitudinal instability, Vortex shedding, Shear layer instability.
Book Synopsis Numerical Simulations of the Flowfield in Central-Dump Ramjet Combustors. 2. Effects of Inlet and Combustor Acoustics by : K. Kailasanath
Download or read book Numerical Simulations of the Flowfield in Central-Dump Ramjet Combustors. 2. Effects of Inlet and Combustor Acoustics written by K. Kailasanath and published by . This book was released on 1988 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: A potentially important source of large pressure oscillations in compact ramjets is a combustion instability induced by the interaction of large-scale vortex structures with the acoustic modes of the ramjet. To study these interactions, we have performed time-dependent, compressible numerical simulations of the flow field in an idealized ramjet consisting of an axisymmetric inlet and a combustor. The simulations indicate strong coupling between the flow field and the acoustics of both the inlet and the combustor. For the cases studied, forcing at the first longitudinal acoustic mode of the combustor induces vortex-rollup near the entrance to the combustor at that frequency. A low frequency oscillation is also observed in all the simulations. Pressure and velocity fluctuations in the inlet indicate that the low frequency corresponds to a quarter-wave mode in the inlet. Changing the length of the inlet appropriately changes the observed low frequency. The merging pattern of the inlet is changed. These merging patterns are explained on the basis of an interaction between the vortex-rollup frequency and the acoustic modes of the inlet and combustor. Keywords: Ramjet, Combustion instability, Turbulence. (mjm).
Book Synopsis Pressure Losses in Simple Dump Combustors by :
Download or read book Pressure Losses in Simple Dump Combustors written by and published by . This book was released on 1972 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume limited missiles require a particularly exacting form of component integration. In the integral rocket ramjet (IRR) system the propellant, for the solid rocket booster, is cast directly into the same volume that is used for the ramjet combustor. This study is directed to a better understanding of the pressure losses in dump combustors. Attendant to this study was an effort to simplify methods of predicting compressible flow losses. Application of the incompressible pressure loss factors and equations to compressible problems can lead to serious errors at Mach numbers above 0.3. During this study an equation was derived to predict compressible pressure losses. This equation expresses the pressure loss as a function of the Mach number and a pressure loss factor which is independent of Mach number. Subsequently it was found that the compressible pressure loss factor, called N sub D the dissipation number, was numerically equal to the incompressible pressure loss factor, K sub t, for any given fluid system. The incompressible parameter is basically a function of geometry and Reynolds number and there exists a wealth of data relating to it. Two basic dump combustor designs were selected for testing because of their possible use in missile propulsion. The first was a coaxial circular inlet model, the second a dual side-mounted rectangular inlet model. The measured dissipation numbers were compared to the predicted incompressible parameters and found to be encouragingly similar. The results of this study show, on a preliminary basis, that it may be possible to use the existing incompressible data to predict compressible pressure losses.
Book Synopsis Turbulent Combustion Modelling in a Side Dump Ramjet Combustor by : X. Montazel
Download or read book Turbulent Combustion Modelling in a Side Dump Ramjet Combustor written by X. Montazel and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Combustion Efficiency in a Dual-inlet Side-dump Ramjet Combustor by : Martin W. Deppe
Download or read book Combustion Efficiency in a Dual-inlet Side-dump Ramjet Combustor written by Martin W. Deppe and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A dual, axially-in-line, side-dump, liquid-fueled ramjet combustor was designed and tested with varying fuel-air ratios, atomizer types, and air distributions between the two inlets. Particle size distributions produced by the atomizers were measured at the inlet duct plane. When operated in a contra- flow direction, all of the atomizers produced excellent atomization with a Sauter mean diameter less than 14 microns. The dual, in-line inlets provided improved flammability limits and combustion efficiencies at lean fuel-air ratios when compared to single side-dump performance. Direct injection of approximately 20% of the fuel flow into the dome region was found to provide improved lean flammability limits for the single side-dump, but was not required with the dual inlets. The fuel distribution in the inlet duct required for good flammability limits and combustion efficiency was opposite to that required to prevent pressure oscillations, indicating that a dump plane aero-grid will often be necessary. A dump angle of 45 deg resulted in lower than desired combustion efficiencies, apparently due to poor mixing with the air from the aft inlet.
Book Synopsis Reacting Flow Studies in a Dump Combustor by : Alison Anne Behrens
Download or read book Reacting Flow Studies in a Dump Combustor written by Alison Anne Behrens and published by . This book was released on 2007 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
